Connect the power into the input end of the board. Test between the connections at the other end and it should read the voltage the chip is set for. ...
IMPORTANT I have recently dug this out of a box and tried to regulate 9v from an RC car battery, it did work, but then there was a puff of smoke and it became extremely hot. This may be because i have previously fried the regulator, but i thought i would let you all know so you can be careful. I may need some filtering capacitors, not sure. please tell me if you have any ideas.
This is the circuit for converting a 12V car supply to 4.5V.
You will need:
2 X 2 wire PCB mounted terminal blocks (optional)
1 X diode
1 X L78S05CV voltage regulator chip
Some verro board